CN103334357A - Viaduct road embankment structure with lower pile foundation bearing platform extending in roadbed, and construction method - Google Patents

Viaduct road embankment structure with lower pile foundation bearing platform extending in roadbed, and construction method Download PDF

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Publication number
CN103334357A
CN103334357A CN2013102276098A CN201310227609A CN103334357A CN 103334357 A CN103334357 A CN 103334357A CN 2013102276098 A CN2013102276098 A CN 2013102276098A CN 201310227609 A CN201310227609 A CN 201310227609A CN 103334357 A CN103334357 A CN 103334357A
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roadbed
stake
soil
breadth
bent cap
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CN103334357B (en
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章永泉
章亦男
阮美琴
李发林
黄秦
施五四
奕天校
张超
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Shanghai Jiashi (group) Co Ltd
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Shanghai Jiashi (group) Co Ltd
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Abstract

The invention relates to a viaduct road embankment structure with a lower pile foundation bearing platform extending in a roadbed, which mainly comprises roadbed treatment piles, pile top vertical and horizontal connection cover beams, light filler layers, stabilized soil backfill layers and horizontal reinforcement layers, wherein roadbed treatment piles are arranged in the roadbed, and connecting rebars are connected on the pile tops in advance; the vertical and horizontal connection cover beams are poured on the pile tops of the roadbed treatment piles and are connected with pile bodies through the pile top connecting rebars; the roadbed is backfilled by stabilized soil and the light filler layers in a layered mode, and is internally provided with the horizontal reinforcement layers. According to the viaduct road embankment structure, the integrality of a viaduct road embankment can be greatly improved, the property of roadbed filler can be improved, the weight of the filler is reduced, the problem of pavement longitudinal cracks and waves due to differential settlement caused by that a pile foundation bearing platform extends in the roadbed is solved, and the god technical and economic benefits are gained. The invention also provides a construction method of the road embankment structure.

Description

Pile foundation support table stretches into embankment structure and the job practices of roadbed under a kind of viaduct
Technical field
The invention belongs to the ground process field, relate to subgrade deformation combination control structure under a kind of viaduct, particularly pile foundation support table stretches into embankment structure and the job practices thereof of roadbed under a kind of viaduct, this structure has multiple advantages such as the supporting capacity that improves subgrade soils, the globality that strengthens roadbed filling, minimizing filler weight, be applicable in soft clay area highway, the town road that roadbed is handled engineering under the viaduct, be particularly useful for the viaduct cushion cap and stretch into the roadbed that roadbed causes that easily the road surface produces the crack and handle.
Background technology
Expansion day by day along with the urban traffic demand, viaduct, overpass bridge proportion in Urban Traffic Planning is increasing, but because the central authorities of urban road isolation greenbelt width is less, when design pile foundation support table size is big, the bridge pile foundation cushion cap tends to stretch in the roadbed of below, road travel road under the viaduct, has a strong impact on the globality of road structure.Simultaneously, because the coastal all provinces of China are distributed with weak soil comparatively widely, it has that moisture content height, compressibilty are big, poor permeability, highly sensitive, intensity is low and characteristics in uneven thickness etc., road structure is prone to comparatively significantly settlement after construction under the action of traffic loading of top.
Engineering is actual in a large number shows, construction is in viaduct, the bridge crossing engineering of soft clay area, because the bridge pile foundation sedimentation is less, subgrade settlement is big, if subgrade deformation under the viaduct is lacked effective control measure and structure, produce many adverse effects or potential safety hazard will for construction benefit and the driving quality of road, as subgrade soils sedimentation meeting bridge pier is produced the side direction frictional resistance, change the stress performance of pile body; The differential settlement distortion of roadbed can cause engineering diseases such as longitudinal crack or pavement track occurring near the cushion cap edge, shortens the curing period of road; The road structure distortion can influence the performance of road structure, and then influences comfortableness, the reduction road passage capability of driving, even causes traffic safety hidden danger.
The measure of the problems referred to above of each department reply at present mainly contains overlay method, the displacement of excavation light material, slip casting method etc.The overlay method namely overlays ground surface material more than former road crust, though this method can remedy the differential settlement between the highway section rapidly, improve the current condition of highway fast, but because it fails to improve the load-carrying properties on basis, bottom, add overlay and can increase the weight of the weight of road structure, unfavorable for settlement of soft foundation control, be prone to all the more more vicious circle of sedimentation of shop, and the engineering cost that repeatedly overlays is also higher.Slip casting method is to be pressed into a certain amount of cement paste by Grouting Pipe to reinforcing area, improve the supporting capacity of roadbed by the curing subgrade soil, but this reinforcement measure is purpose to reinforce the soft base of shallow-layer or top roadbed, to being difficult to slip casting under the darker situation of weak soil to hardpan relatively, the embankment center is also injected than difficulty in the highway section that roadbed is wideer, simultaneously grouting and reinforcing ground such as grouting pressure or process control is improper also easily causes slip casting inhomogeneous cause that road structure inhomogeneous deformation occurs under the overlying burden effect.Light material changes and fills out is to adopt light material to replace original filling for embankment, this method has pretreating effect preferably to overlying burden, the reduction road surface bulk settling that reduces roadbed, but it is higher to play engineering cost when wide-scale adoption, and because the bearing capacity of filler itself is not high, anti-shearing force is relatively poor, inadequate by the road structure distortion fashion that viaduct pile foundation and roadbed subsidence difference cause in reply, especially under the soft foundation condition.Adopt light material to replace roadbed filling, though can reduce the weight of embankment load, but this method is difficult to improve the globality of the zones of different soil body in the roadbed scope, the difficult inhomogeneous deformation amount of coordinating the control roadbed still, and to the soil body bending resistance draw performance to improve effect comparatively limited.Therefore, as adopting the light filler railway embankment using, need improve anti-shearing, the bending resistance of embankment and draw performance.
In sum, engineering circle is punished mainly to remedy afterwards at the road disease under the viaduct and subgrade deformation problem at present, as overlaying method, the displacement of excavation light material and slip casting method etc., these methods have also obtained comparatively desirable punishment effect under certain engineering specifications.But in general, because these methods do not relate to the structure optimization combination of embankment, it is limited that it improves effect, is difficult to fundamentally solve the compatibility of deformation problem of embankment fill material under the bridge pier, even the more serious vicious circle of problem can occur more remedying.
In view of above-mentioned technical background, pile foundation support table stretches into the road disease problem that roadbed may cause under the viaduct in order better to prevent and treat, improve the construction benefit of road, need a kind of rational road under bridge embankment structure of invention at present badly, make it both can effectively reduce the deflection of subgrade soil under the viaduct, improve the performance of roadbed filling, also can improve the globality of embankment fill material, reduce the weight of filler.
Summary of the invention
The objective of the invention is to by reinforcing road bed, reduce overlying burden and strengthen three kinds of settlement Control measures of road structure cooperative bearing performance to combine, invent and a kind ofly can effectively prevent and treat road differential settlement under the viaduct, improve under the novel viaduct of roadbed filling performance subgrade defect and prevent and treat structure and job practices.
In order to realize above-mentioned technical purpose, the present invention has adopted following technical scheme:
Pile foundation support table stretches into the embankment structure of roadbed under a kind of viaduct, it is characterized in that described structure mainly handles stake, stake top by roadbed and form to connecting bent cap, light filler layer, solidified earth backfill layer, transversal reinforcement layer in length and breadth; Roadbed is set in roadbed handles stake, the default connecting reinforcement in stake top; Build in roadbed processing stake stake top to connecting bent cap in length and breadth, strengthen being connected with pile body by stake top connecting reinforcement; Roadbed adopts solidified earth and light filler back-filling in layers, in establish the transversal reinforcement layer.
It is weak soil compaction, non-soil compaction stake that roadbed is handled stake, pile body is apart from viaduct cushion cap edge 500mm ~ 800mm, penetrate basic unit flabbily, squeeze into bearing stratum 500mm ~ 2000mm, pile spacing is 3000mm ~ 4000mm, in length and breadth to uniformly-spaced arranging, stake is long optionally to be reduced or remains unchanged according to the smooth-going transition principle of sedimentation.
The stake top is steel concrete integral cast-in-situ bent cap to connecting bent cap in length and breadth, is groined type, and stake roof rail in edge is extended 600 ~ 1000mm short distance cantilever, and the bent cap width is 1 ~ 2 times that ground is handled stake stake footpath; Reinforcing bar is connected with a roadbed processing stake top rebars in the bent cap, and connected mode is that welding or colligation connect.
Described solidified earth backfill layer is formed with the curing compound mix by former roadway excavation soil, is cured to the stake top in length and breadth to connecting square 600mm ~ 1200mm under the bent cap beam, and its thickness is 1500 ~ 3000mm, and curing compound is cement, lime or soil-solidified-agent.
Light filler is air bubble mix light-textured soil, foam beads mix light-textured soil or EPS particle light soil.
The transversal reinforcement layer is that high tensile reinforcement net sheet or steel are moulded geo-grid, requires one or more layers is set according to the filler compatibility of deformation.
Pile foundation support table stretches into the job practices of the embankment structure of roadbed under the described viaduct, it is characterized in that may further comprise the steps:
1) prepare before the construction: according to design drawing, handle the construction plant, measure the stake position, stake position outline line draws;
2) soil taking hole forming: boring extracting soil should be aided with mud off in case of necessity or bury casing underground;
3) roadbed is handled pile driving construction: behind the clear hole, the construction ground is handled stake in pore-forming, according to designing requirement control pile body embedded depth, and on the stake top default with in length and breadth to the reinforcing bar that is connected the bent cap connection;
4) dig the backfill solidified earth under: after treating that roadbed processing stake intensity reaches designing requirement, the road breaking base bankets and pushes up following design elevation to stake under the mode that employing hand excavation and mechanical equivalent of light excavation combine, and layering was all spread and is backfilled to a top after the soil body that digs out was solidified;
5) construct to connecting bent cap in length and breadth in the stake top: after treating that backfill has certain intensity, the stake top of handling stake at roadbed installs template, and the default reinforcing bar in connection stake top, is built stake and pushed up in length and breadth to connecting bent cap to the reinforcing bar that is connected bent cap with in length and breadth;
6) fill solidified earth: after treating that the stake top reaches design strength to the connection bent cap in length and breadth, stripping continues placement in layers and solidifies back fill course;
7) the transversal reinforcement layer is laid: solidified earth is laid the transversal reinforcement layer, and is carried out stretch-draw after laying and finishing;
8) light soil that paves: after backfill was solidified in compacting, the light filler layer paved;
9) road surface structare layer construction: carry out the road structure construction according to designing requirement.
The present invention has following characteristics and beneficial effect:
(1) adopts weak soil compaction, non-soil compaction stake to carry out roadbed and handle, can reduce the pile body construction to the influence of contiguous viaduct pile foundation support table; Roadbed handles that the stake stake is long optionally to be reduced or remain unchanged according to the smooth-going transition principle of sedimentation, can better coordinate the distortion of subgrade soils.
(2) adopt integral cast-in-situ to connecting bent cap in length and breadth, and be connected with the reserved steel bar of weak soil compaction stake by the top and be an integral body, both can effectively improve the globality of road structure, also can reduce the load of soft layer.
(3) embankment fill material adopts air bubble mix light-textured soil and solidified earth, not only can reduce the weight of filler, and can improve the intensity of embankment fill material, can also reduce embankment earthwork carrying engineering quantity, the characteristics of utilizing air bubble mix light-textured soil to have higher-strength, water resistance and durability also can be saved the construction of the steady layer of water in the subgrade construction.
(4) between air bubble mix light-textured soil and solidified earth and in the curing soil layer, the transversal reinforcement layer is set, promotes the roadbed shear resistance, can play the reinforcer globality simultaneously, adjust the upper load distribution, coordinate the effect that embankment is out of shape.
In a word, characteristics of the present invention are by weak soil compaction stake load to be reached the roadbed bearing stratum, by arranging in length and breadth to connecting globality and the anti-sedimentation capacity that bent cap strengthens embankment structure, improve the performance of filler by backfill solidified earth, light soil, by the compatible deformation ability of transversal reinforcement layer reinforcer is set, has technical economic benefit preferably.
Description of drawings
Fig. 1 is the elevational schematic view that pile foundation support table stretches into the embankment structure of roadbed under the viaduct;
Fig. 2 is that Fig. 1 is along A-A line sectional drawing;
Fig. 3 is that Fig. 1 is along B-B line sectional drawing;
Fig. 4 is that Fig. 1 is along C-C line sectional drawing;
Among the figure: 1-roadbed is handled stake, 2-reinforcing cage, 3-weak soil layer, 4-bearing stratum, 5-road surface structare layer, 6-lightweight soil layer, 7-transversal reinforcement layer, 8-curing back fill course, 9-stake top in length and breadth to connecting bent cap, 10-road kerb, 11-greenbelt, 12-isolated column, 13-bridge pier, 14-pile foundation support table, 15-viaduct pile foundation.
Specific embodiment
The design and construction technical requirements of bridge pile foundation and pile foundation support table, the design and construction technical requirements of weak soil compaction stake, reinforcing bar stacking, lifting, colligation construction technical requirement, design of concrete and construction technical requirement etc., be not repeated in the present embodiment, emphasis is set forth the embodiment that the present invention relates to structure.
Fig. 1 is the elevational schematic view that pile foundation support table stretches into the embankment structure of roadbed under the viaduct; Fig. 2 is that Fig. 1 is along A-A line sectional drawing; Fig. 3 is that Fig. 1 is along B-B line sectional drawing; Fig. 4 is that Fig. 1 is along C-C line sectional drawing.Shown in Fig. 1 ~ 4, the embankment structure that pile foundation support table stretches into roadbed under the viaduct is mainly handled stake 1, lightweight soil layer 6, transversal reinforcement layer 7, solidified earth back fill course 8, stake top by roadbed and is partly formed to connecting bent cap 9 etc. in length and breadth.
Ground is handled stake 1 and is adopted bored pile, stake footpath 400mm, pile body and viaduct pile foundation support table 14 distances are 500mm, roadbed is handled stake 1 degree of depth of squeezing into bearing stratum and is reduced gradually with the increase of pile body and bridge pile foundation cushion cap 14 distances, wherein to squeeze into the degree of depth of bearing stratum 4 be 1000mm at the long stake stake end, and the degree of depth that stub is squeezed into bearing stratum is 500mm; The concrete strength of pile grade is C30, and it is 16mm that the longitudinal reinforcement of reinforcing cage 2 adopts the HRB335(diameter) indented bars, it is 8mm that spiral bar adopts the HPB300(diameter) plain steel-bar.The length that the longitudinal reinforcement of reinforcing cage 2 stretches out stake top is 200mm, as with in length and breadth to the dowel that is connected bent cap 9; The concrete construction requirement of roadbed processing stake 1 meets the regulation of current specifications, and construction apparatus clear height requires to be lower than the viaduct height, avoids the influence to pile foundation support table 14 and viaduct pile foundation 15 during construction ground processing stake as much as possible.
The stake top is steel concrete integral cast-in-situ bent cap to connecting bent cap 9 in length and breadth, and strength grade of concrete is C30, and the width of bent cap in the roadbed filling zone is 500mm, highly be 400mm, in length and breadth to connection, to overlook and be groined type, 600mm short distance cantilever is extended on stake top in edge; Adopting the HRB335(diameter to the longitudinal reinforcement that connects bent cap 9 in length and breadth is 16mm) indented bars, it is 8mm that stirrup adopts the HPB300(diameter) plain steel-bar; Be connected with the longitudinal reinforcement colligation of reinforcing cage 2 to the longitudinal reinforcement that connects bent cap 9 in length and breadth.
Solidify back fill course 8 by the boring soil body that takes out, discarded native and curing compound mixes together when digging the part soil body and levelling of the land down, curing compound is selected Portland cement for use, and the cement strength grade is 32.5MPa, and the curing agent ratio example is the 8%(mass ratio).Solidified earth backfill layer thickness is 2000mm, comprise that stake top is in length and breadth to connecting under the bent cap 1000mm and 6 ends of lightweight soil layer to stake top in length and breadth to the 600mm that is connected bent cap 9 end faces, and backfill is also done to connecting 9 spaces of bent cap in length and breadth in the stake top,, solidify the protruding layer 8 of backfill and extend to around the bridge pier 13 in length and breadth to connecting shop, bent cap 9 end face places one deck transversal reinforcement layer 7 on the stake top.
Transversal reinforcement layer 7 selects for use steel to mould geo-grid, and steel is moulded the every linear meter(lin.m.) tensile yield of geo-grid power 〉=80kN/m, elongation at yield rate≤3%.With laydown machine or manual method grid is slowly drawn the shop forward, the 10 meters progress pedestrians wage adjustment of every shop directly once, laterally the geo-grid overlap is interted connection every 1000mm with the 8# iron wire along roadbed, and on the grid of laying every 1500mm with U-shaped nail anchoring once.
Lightweight soil layer 6 adopts air bubble mix light-textured soil, is located to be positioned under the road surface structare layer thickness 500mm, embankment equal thickness laying in the scope under the viaduct.The match ratio of air bubble mix light-textured soil should be selected according to requirements such as design strength, wet density, flowabilities, air bubble mix light-textured soil design wet density is for being not more than 6.5kN/m3, unconfined compression strength all was not less than 0.8MPa in 28 days, cement adopts the 32.5# Portland cement, and the bubble ratio is not less than 65%; At lightweight soil layer 6 and shop, curing back fill course 8 contact surface places one deck transversal reinforcement layer 7.
Adopting bored pile is that roadbed is handled pile foundation support table under the viaduct of stake to stretch into the main construction sequence of embankment structure of roadbed as follows:
1) prepares before the construction.According to design drawing, handle the construction plant, measure the stake position, stake position outline line draws.
2) soil taking hole forming.Boring extracting soil should be aided with mud off in case of necessity or bury casing underground, and stake is long to be determined according to designing requirement.
3) roadbed is handled pile driving construction.Behind the clear hole, transfer reinforcing cage 2, the end face of reinforcing cage 2 is higher than aperture 400mm, and after reinforcing cage 2 was laid and finished, concreting formed roadbed and handles stake 1.
4) dig the backfill solidified earth under.After treating that roadbed is handled the intensity of stake 1 and reached designing requirement, the road breaking base bankets 3 to the following 1000mm of roadbed processing stake 1 end face under the mode that employing hand excavation and mechanical equivalent of light excavation combine, the soil body that digs out is solidified the back layering all spread and be backfilled to the stake top, form the curing back fill course 8 of bottom.
5) the stake top is in length and breadth to connecting the bent cap construction.After treating that roadbed is handled the curing back fill course 8 of stake 1 bottom and reached design strength, the stake top of handling stake at roadbed installs template, template width 500mm, and connect roadbed handle the default reinforcing bar at stake 1 top with in length and breadth to the reinforcing bar that is connected bent cap 9, concreting forms the stake top in length and breadth to connecting bent cap 9.
6) fill solidified earth.After treating that the stake top reaches design strength to connection bent cap 9 in length and breadth, first floor transversal reinforcement layer 7 is laid in form removal, and carries out stretch-draw, fixing, and back fill course 8 is solidified in placement in layers again.
7) the transversal reinforcement layer is laid.After curing back fill course 8 fills and finishes, lay second layer transversal reinforcement layer 7, and carry out stretch-draw, fixing.
8) light soil that paves.The air bubble mix light-textured soil layer 6 of suitable thickness paves.
9) road surface structare layer construction.Carry out the construction of road structure 5 and road kerb 10, greenbelt 11, isolated column 12 etc. according to designing requirement.

Claims (7)

1. pile foundation support table stretches into the embankment structure of roadbed under the viaduct, it is characterized in that described structure mainly handles stake, stake top by roadbed and form to connecting bent cap, light filler layer, solidified earth backfill layer, transversal reinforcement layer in length and breadth; Roadbed is set in roadbed handles stake, the default connecting reinforcement in stake top; Build in roadbed processing stake stake top to connecting bent cap in length and breadth, strengthen being connected with pile body by stake top connecting reinforcement; Roadbed adopts solidified earth and light filler back-filling in layers, in establish the transversal reinforcement layer.
2. pile foundation support table stretches into the embankment structure of roadbed under the viaduct according to claim 1, it is characterized in that it is weak soil compaction, non-soil compaction stake that described roadbed is handled stake, pile body is apart from viaduct cushion cap edge 500mm ~ 800mm, penetrate basic unit flabbily, squeeze into bearing stratum 500mm ~ 2000mm, pile spacing is 3000mm ~ 4000mm, and in length and breadth to uniformly-spaced arranging, stake is long optionally to be reduced or remain unchanged according to the smooth-going transition principle of sedimentation.
3. pile foundation support table stretches into the embankment structure of roadbed under the viaduct according to claim 1, it is characterized in that described stake top is steel concrete integral cast-in-situ bent cap to connecting bent cap in length and breadth, be groined type, stake roof rail in edge is extended 600 ~ 1000mm short distance cantilever, and the bent cap width is 1 ~ 2 times that ground is handled stake stake footpath; Reinforcing bar is connected with a roadbed processing stake top rebars in the bent cap, and connected mode is that welding or colligation connect.
4. pile foundation support table stretches into the embankment structure of roadbed under the viaduct according to claim 1, it is characterized in that described solidified earth backfill layer is formed with the curing compound mix by former roadway excavation soil, be cured to stake top in length and breadth to connecting square 600mm ~ 1200mm under the bent cap beam, its thickness is 1500 ~ 3000mm, and curing compound is cement, lime or soil-solidified-agent.
5. pile foundation support table stretches into the embankment structure of roadbed under the viaduct according to claim 1, it is characterized in that described light filler is air bubble mix light-textured soil, foam beads mix light-textured soil or EPS particle light soil.
6. pile foundation support table stretches into the embankment structure of roadbed under the viaduct according to claim 1, it is characterized in that described transversal reinforcement layer is that high tensile reinforcement net sheet or steel are moulded geo-grid, requires one or more layers is set according to the filler compatibility of deformation.
7. pile foundation support table stretches into the job practices of the embankment structure of roadbed under the described viaduct of the arbitrary claim of claim 1 ~ 6, it is characterized in that may further comprise the steps:
1) prepare before the construction: according to design drawing, handle the construction plant, measure the stake position, stake position outline line draws;
2) soil taking hole forming: boring extracting soil should be aided with mud off in case of necessity or bury casing underground;
3) roadbed is handled pile driving construction: behind the clear hole, the construction ground is handled stake in pore-forming, according to designing requirement control pile body embedded depth, and on the stake top default with in length and breadth to the reinforcing bar that is connected the bent cap connection;
4) dig the backfill solidified earth under: after treating that roadbed processing stake intensity reaches designing requirement, the road breaking base bankets and pushes up following design elevation to stake under the mode that employing hand excavation and mechanical equivalent of light excavation combine, and layering was all spread and is backfilled to a top after the soil body that digs out was solidified;
5) construct to connecting bent cap in length and breadth in the stake top: after treating that backfill has certain intensity, the stake top of handling stake at roadbed installs template, and the default reinforcing bar in connection stake top, is built stake and pushed up in length and breadth to connecting bent cap to the reinforcing bar that is connected bent cap with in length and breadth;
6) fill solidified earth: after treating that the stake top reaches design strength to the connection bent cap in length and breadth, stripping continues placement in layers and solidifies back fill course;
7) the transversal reinforcement layer is laid: solidified earth is laid the transversal reinforcement layer, and is carried out stretch-draw after laying and finishing;
8) light soil that paves: after backfill was solidified in compacting, the light filler layer paved;
9) road surface structare layer construction: carry out the road structure construction according to designing requirement.
CN201310227609.8A 2013-06-07 2013-06-07 Viaduct road embankment structure with lower pile foundation bearing platform extending in roadbed, and construction method Active CN103334357B (en)

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CN112074640B (en) * 2019-04-02 2021-12-21 株式会社璞莱克斯 Concrete foundation structure and construction method thereof
CN110273339A (en) * 2019-07-18 2019-09-24 厦门东翔工程设计有限公司 A kind of land subsidence crack resistence structure and its construction method
CN110983891A (en) * 2019-12-25 2020-04-10 长沙理工大学 Highway reconstruction and expansion assembly type roadbed structure and construction method thereof
CN111118967A (en) * 2019-12-30 2020-05-08 中铁第六勘察设计院集团有限公司 Construction method for filling foam light soil foundation pit of railway roadbed in soft soil area
CN112942003A (en) * 2021-02-04 2021-06-11 河海大学 Vertical pouring type solidified soil embankment construction mold and method
CN112942003B (en) * 2021-02-04 2022-05-13 河海大学 Vertical pouring type solidified soil embankment construction mold and method
CN113293706A (en) * 2021-05-25 2021-08-24 中建三局集团有限公司 Synchronous design and construction method for bridge pile foundation and peripheral underground structure
CN113293706B (en) * 2021-05-25 2022-05-20 中建三局集团有限公司 Synchronous design and construction method for bridge pile foundation and peripheral underground structure

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